The renal threshold of a substance refers to
A) the number of protein transporters for the substance per tubule.
B) the plasma concentration of the substance below which it does not appear in the urine.
C) the concentration of the substance found in the kidney before the substance becomes toxic.
D) the concentration of the substance in the urine that results in an overall increase in urine volume.

Question

Quizplus · Accepted Answer

The renal threshold is the plasma concentration level at which a substance begins to appear in the urine because the kidneys can no longer reabsorb it efficiently.

The Renal Threshold of a Substance Refers to